Before we point out the big chips you've probably already heard about, here are some interesting features of this giant PCB:

Bothhand USA GST5009 LF 1000 Base-T Magnetics Module

Murata Piezo Buzzer

3v battery backup (likely used for keeping the device's time and date)

Sony J20H100 Wi-Fi Module

Power input prong that slots directly into the power supply

M.2 SSD expansion slot—likely to be very useful, as soon as Sony actually enables it.

Wi-Fi module antenna connector